Ballpoint pen



FIG. 1 is a front elevational view of a ballpoint pen in accordance with my design;

FIG. 2 is a left side elevational view thereof, with the right side elevational view being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a top, front, left perspective view thereof; and,

FIG. 7 is a top, front, right perspective view thereof.

The feature on the top in broken lines in FIGS. 1, 2, 5, 6 and 7 is included for the purpose of showing a portion of the ballpoint pen that forms no part of the claimed design. 

CLAIM The ornamental design for a ballpoint pen, as shown and described. 